Magnet-valve.



G. P. THURBER.

MAGNET VALVE.

APPLICATION FILED JUNE 8,1911.

1,142,382. I Patented June- 8, 1915.

2 SHEETS-SHEET I.

G.KP. THURBER.

MAGNET VALVE.

APPLICATION man JuNE-a. 19H.

Patented June 8, 1915.

2 SHEETS-SHEET 2.

(inventor 7 fd @513 mi 0111c @m mw wi/li'nedo o (4% a Wa /aw ww UNITE GUY P. 'rnunnnn, or PITTSBURGH,

MENTS, 'ro AUTOMATIC TRAIN s ATES.

PENNSYLVANIA, A CORPORATION OF DELAWARE.

MAGNET-VALVE.

Specification of Letters Yatent.

Continuation in part of application Serial No. 389,887, fi1ec1 August 23, 1907. This application filed June 8,

1911. Serial No..682,052.

To all whom it may concern:

Be it known that I, GUY I. Tnnnnnn, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Magnet-Valves, of which the following is a specification.

My invention relates particularly to a magnet valve for train controlling systems such for instance as shown in my pending applications Serial No. 389,887, filed Aug. 23, 1907, and Serial No. 461,141, filed Nov. 5, 19.08. In these and such systems fluid actuated means are usually provided for doing the actual work of controlling the train, while an electrically controlled device is usually used for setting the train controlling means into operation.

My invention has for its aim to provide a comparatively simple and wholly reliable device which shall be electrically controlled, to regulate the operation of the fluid operated train controlling means.

To these ends, the invention consists in a preferred form of a valve which controls the passage of the actuating fluid to the de vice to be actuated, which valve is itself controlled by fluid operated means, together with electrically controlled means for regulating the passage of the fluid .under pressure to the fluid operated means. Specifically the fluid operated means is preferably in the form of a diaphragm, which, by suitable means is connected with the valve, for operating the same, and the electrically controlled means may simply be an electromagnet which operates a valve in a passage leading to the diaphragm. The device to be actuated may simply be a signal, such as a whistle, or it may be an actual train controlling device, such as a throttle or brake controlling valve.

Various other objects and features of the invention will appear as the specification proceeds. I

In the drawings I have illustrated my invention as applied to and in use in conneotion with a train controlling system of my own invention, but I would not limit the invention to this particular use, and I would furthermore have it understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

' In the drawings: Figure 1 isa more or less diagrammatic view illustrating the inventlon as applied to a train controlling system like the one shown in my Patent No. 822,029. Fig. 2 is avertical sectional view of a preferred embodiment of the invention.

Like reference characters have been used throughout the several views to indicate like parts.

In Fig. 1, only so much of a cab circuit as is necessary to illustrate a practical working of the invention is shown. In this view the invention is shown in two of its uses, the first magnet valve 1, being employed to control an actuated device, which in this caseis a whistle 2, and also a fluid sustained timing switch 3,and the second magnet valve 4, serving to control simply the action of an actuated device, which in this case consistsof a throttle controlling valve 5.

Compressed air or other suitable actuating fluid is led from a reservoir 6 or-other source of supply, through a pipe 7 to the first magnet valve and through a pipe 8 to the second magnet valve.

In its preferred form the magnet valve consists in part of a valve casing 9 (see Fig. 2) provided with an inlet 10, through which the fluid under pressure enters and an outlet 11, through which the fluid flows to the device to be actuated. The flow of air (or other fluid under pressure) from the inlet to the outlet is by way of passage 12, past valve 13, and passage 14 to the outlet and thence by pipe connection 15 to the fluid actuated The valve 13 which may be termed the supply valve is normally held in engagement with its valve seat 16, by a pressure operated member or device, which in this case preferably takes the form of a diaphragm 17 air being led to the upper side of this diaphragm by means of a passage 18, communicating with the inlet.

For the purpose of operating the supply valve any suitable means of connectlon between the diaphragm and the valve may be provided. In the construction illustrated,

device.

the valve is shown as supported by a lower for the purpose has the-head 21 of the and bearing on top diaphragm 19, which a socket 20 in which valve stem is engaged,

.of the same.

of this valvc-supporting-socket is a stem 22 carrying a disk member 23 dlsposed directly beneath and adapted to be engaged by the upper diaphragm .17 when the same is deflected by the pressure of an" on top It will thus be seen that a suiiicient air pressure upon the top of the diaphragm 17 will deflect the same downwardly, and by means of the connections described, will hold the supply valve 13 closed. Means are provided .for opening the Valve when pressure on the main diaphragm is released. In the present instance the lower supporting diaphragm 19 serves as the means for lifting the valve. To gain thls result, the air passage 12 leads from the inlet to chamber 24 beneath the supportingdiaphragm 19. Pressure is thus brought to bear upon' both the diaphragms, the force of oneopposing that of the other. The diaphragms are in some way unbalanced with respect to each other so that there will always he a tendency to maintain the supply valve controlled thereby, closed. This unbalanced condition of the two diaphragms-is preferably obtained by making the main diaphragm larger or of greater surface area than the lower diaphragm. This superior pressure on top of the main diaphragm will thus normally overcome the lesser 'upward pressure on the supportin diaphragm to hold the supply valve close The operation of the supply valve is preferably controlled by controlling the air pressure on top of the main diaphragm. To accomplish this, a controlling valve, 25 is preferably located in the passage 18, which valve is preferably under control of an electromagnet 26. This electromagnet may be of ordinary construction, and it is con-.

nected to the valve 25 in-any suitable way.

In the form illustrated the magnet is provided with an armature 27 carried by an armature or solenoid rod 28 extending through the core of the magnet and provided at its lower end with a seat 29 in which is engaged the upper reduced end or valve stem 30 of the valve 25. A spring 31 exerts its tension upon the valve 25 to hold the same closed, and to accommodate the valve and the spring the passage 18 may be enlarged at this point into a chamber 32. The lower end of the solenoid rod carries a valve 33 to engage with the valve seat 34, this valve 33 serving to control the escape of air through'the exhaust passage 35.

The device to be actuated, which in the case of the first magnet valve, consists of a whistle, and in the case of the second magnet valve consists of a throttle controllingde-' vice 5, receives the actuating fluid from the magnet valve by means of a pipe connection 15. Considering first the magnet valve 1; the magnet of this valve conductors 36 and 37., included in a normally is, I by means of closed and charged cab circuit, this circuit usually including a circuit breaking device 67 of some sort and a suitable source of current 38. -Thus normally the electromagnet is energized to close the valve 33 leading to exhaust passage 35 and to open the controlling valve 25 in the passage 18 leading to the main diaphragm. In normal operation then the air under pressure acts on the main diaphragm to hold the supply valve 13 closed. When, however, due to any cause, the circuit through the magnet is broken, the magnet will be deiinergized, releasing its armature and permitting the spring 31 to become active to close the controlling valve 25 and lift the exhaust valve 33 from its seat. Pressure on top of the main diaphragm is thus released by way of exhaust passage 35 and the pressure on the under side of the supporting diaphragm 19 then becomes effective to lift valve 13 and permit flow of air from the inlet through passage 12, past valve 13, and out through passage 14 and pipe connection 15, to the whistle. The action ofthe magnet valve 4' is the same as just described except that in this case'when the supply valve is opened, the air flows through pipe 15 to actuate the throttle controlling valve. This throttle controlling valve is illustrated diagrammatically in Fig. 1, and, as so shown, consists of a cylinder within which there is a pressure-operated piston, ton rod 39 of which engages with a lever 40.

In connection-with the magnet valve 1,-1 have shown a timing switch the actuation of the magnet the pisthrottle piston, the piston rod 59 of which carries a contact head 43 for engagement with. a relatively fixed contact 44. Thus the magnet valve 1 serves an additional function,

since it controls the action of a timing switch. When the magnet is energized, air

pressure is brought to bear upon the top of the main diaphragm so asto close the supply valve, and a part of the air flows through the outlet 41 and pipe 42, to the timing switch, so as 'to normally sustain the contact head of the timing switch in engagement with the contact 44. When the magnet is deinergized, the air in the timing switch escapes (to allow the contact head to fall and .break contact) by flowing back up through passage 18, past the valve stem 3 which, uponvalve 1, acts a predetermined time thereafter to rupture 30 and the valve33, out through exhaust port 35. The circuit through the magnet valve 4 is made by means of conductors 45 and 46 and the contacts 43-and 44 of the timing switch. From what has been said, it will be clear that when circuit through magnet valve 1 is ruptured, the timing switch will, after a predetermined time, fall and break the circuit through magnet valve 4, and thereby cause the second magnet valve to throw in operation the throttle controlling valve or other controlling means. In order to allow the necessary freedom of movement of the main diaphragm, escape of any air that might be contained in the space beneath said diaphragm is provided for by way of an escape port 47.

In order to allow for the escape of the fluid from the actuating device after the same has been operated, there is preferably provided an exhaust valve 48. When the magnet is deenergized, as is the case in Fig. 2, a spring-pressed plunger 49 or like de- "vice acts uponthe exhaust valve 48 to hold .said valve closed against its valve seat, but

as soon as the magnet is again energized, the valve 13 is closed, and exhaust valve is opened to permit escape of air from the actuated device back through the passage 50, past the exhaust valve and the passage 51, to the exhaust port 52. The tension of the spring acting on the plunger 49 is of sufiicient' force to hold the, exhaust valve closed against the pressure of the air flow.-

ing past the diaphragm 57. The downward motion of the supply valve 13 may be utilized for the purpose of opening'the exhaust valve upon the reenergization of the magnet. For this reason the valve stem 53 of valve 13 may be continued downward to engage with a member54, which member is in engagement with a corresponding member 55 on the upper end of the stem 56 ofexhaust valve 48. In order that there may be no loss of air, there is preferably interposed a diaphragm 57 between the members 5455, to prevent any air leaking from the supply valve down to the exhaust port.

\Vhen, as with the magnet valve 4, the port 41 is of no utility, this port may be closed by a plug 58.

lVhat is claimed, is:

1. In combination, a diaphragm, means.

for conveying fluid under pressure to the upper side of said diaphragm, a valve located beneath the diaphragm having a part engaged by the diaphragm to hold the valve closed when pressure is present on top of the diaphragm, a valve controlling flow of fluid to the upper side of the diaphragm, and

a normally energized electric magnet adapted when energized to hold said last-mentioned valve open to permit flow of fluid to the u per side of the diaphragm.

2. iii combination, a diaphragm, means for conveying fluid under pressure to said diaphragm, a valve for controlling flow of fluid to the diaphragm, a normally energized electric magnet adapted when energized to hold said valve open, and a valve .actuated by the diaphragm and held closed thereby so long as pressure is maintained on said diaphragm.

. 3. In combination, a fluid actuated device,

and controlling means therefor, comprising,

an electromagnet normally energize adapted when so energized to hold said controlling valve open. I v

4. In combination, a pair of diaphragms, means for conducting fluid under pressure to said diaphragms, a valve actuated by the diaphragms, one of the diaphragms being of greater surface area than the other so as to normally overcome the pressure on the smaller diaphragm to normally hold the valve closed, and electrically controlled means for releasing the pressure on the larger diaphragm to permit the pressure on the smaller diaphragm to become efl'ective to open the valve. a

5. In combination with a fluid-actuated device, a passage for the impelling fluid connected with said device, a valve in said passage,-a pair of diaphragms controlling said valve, means for conducting fluid under I pressure to said diaphragms, one of the said diaphragms being of greater surface area than the other so as to normally overcome the pressure on the smaller diaphragm to normally hold the valve closed, and electrically controlled means for releasing the pressure on the larger diaphragm to permit pressure on the smaller diaphragm to become effective to open the valve.

6. In combination with a fluid-actuated device, a passage for the impelling fluid connected with said device, a valve in said passage, a pair of diaphragms controlling said valve, means for conducting fluid under pressure to said diaphragms, one of the diaphragms being of greater surface area than the other so as to normally overcome the pressure on the smaller diaphragm to normally hold the valve in the closed position, a valve controlling flow of the fluid under pressure to the larger diaphragm, a normally closed electric circuit, and a magnet in said circuit for normally holding said last-mentioned valve open to normally permit flow of the fluid to the larger diaphragm.

7. In combination with a device to be actuated, a passage for conveying an actuating fluid thereto, a valve in said passage, fluidfor releasing operated means for normally holding said valve closed, electrically controlled means means, norma 1y energized to maintain the pressure on the fluid-operated means, and

meansfor' opening the-valve upon release of the pressure on the fluid-operated means.

8. In combination with a device to beactuated, a passage for conveying an actuating fluid thereto, a valve in said passage, fluid- .release of the pressure on the fluid-operated means, and means actuated upon the closing of thevalve to provide an exhaust passage from the fluid-actuated device.

9. ,In combination, train controlling means adapted to be actuated by fluid pressure, a:

I passage for conveying an actuating fluid thereto, a valve in'said passage, a dia hragm J for controlling said valve, means or conveying fluid under pressure to said diaphragm .so as to normally hold the valve closed, a valve controlling flow 'oaf fluid uning switch and diaphragm.

der pressure to the diaphragm, a normally closed and charged electric circuit, and an electromagnet in said circuit adapted to-be energized to hold said last-mentioned valve open to normall permit flow of fluid under pressure tothe iaphragm.

10. In combination, a valve, a diaphragm controlling the same, a passage for conveying fluid under pressure to said diaphragm, a time switch connected to receive fluid under pressure from said passage, and an electrically operated valve in the passage aforesaid controlling flow of fluid under pressure to the diaphragm and the time switch.

11. In combination, a valve, a diaphragm controlling the same, a passage for convey-' ing fluid under pressure to said diaphragm, a time switch connected to receive fluid under pressure from the said passage, a valve in said-passage, and an electromagnet ad'apt ed when energized topermit flow of fluid under pressure-to the diaphragm and timing switch and when denergizedto permit escape of fluid under pressure from the tim- 12. In combination with a fluid actuated device, a valve controlling passage of an actuating fluid to said device, fluid operated means for normally holding said valve closed, a fluid sustained timing switch, and

electrically controlled means for controlling flow of fluid under pressure to the fluid operated means and the timingswitch.

13. In combination, a supply valve, electrically controlled means for normally holding said valve closed, an exhaust valve,

and means for operating said exhaust valve to open the same when the supply valve 1s pressure on the fluidoperated thereby mass Iclosed andto close thel' same when the ply valve is'ope'ned. p i 7 .14. In combination with adevice to be actuated, a passage for conducting fluid under pressure to said device, a supply valve'in said passage, electrically controlled means for holding said valve closed, and an exhaust valve actuatedwhen the supply valve 1s closed toopen an exhaust passage from thefluid actuated device.

15. In combination with aymember'actuated by fluid pressure, a supply valve operated by said member and normally held closed therebyso 'long acted upon by the actuating fluid, a passage for conveyin an actuating fluid to the member: aforesai a controlling valve in said passage, a normally closed and charged elec- 'tric circuit, an electro-magn'et in said circuit,

energized thereby to normally hold the controlling'valve open so that the fluid-actuated member shall be normally-acted upon by the actuating fluid, an exhaust valve controlled by the electro-magnet, arranged to provide for escape of the'actuating fluid from the fluid-actuated member when the electroas said member is magnet is deenergized, and means for opening the supply valvewhen'pressure on the fluid-actuated member is reheved.

16. In combination with a device to be actuated and a supply passage leading thereto, a supply valve in said passage, a member actuated by fluid pressure, arranged when,

acted upon by fluid, under pressure'to hold the supply valveclosed, a passage for conveying an actuating fluidto the said member, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet infsaid circuit, energized ing the supply valve when pressure on the fluid-actuated member is relieved.

to' normally hold the controlling 17. In combination with a device to be actuated and a supply passage leading thereto, a supply valve. insaid passage, an exhaust passage leading from said device, an exhaust valve in said -exhaust passage, a member actuated by fluid pressure and arranged when' acted upon by fluid under pressure to hold the supply valve closed and the exhaust valve open, a passage for conveying an actuating fluid to the fluid-actuated member, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet in said circuit, energized thereby to normally hold the controlling valve open so that the fluid-actuated member shall benormally acted upon by the actuating fluid, an exhaust valve controlled by the electro-magnet arranged to provide for escape of the actuating fluid from the fluid-actuated member when the electromagnet is deenergized, and means for opening the supply valve when pressure on the fluid-actuated member is relieved. 1

- 18. In combination, a normally inactive train controlling device adapted to be operated by fluid under pressure, a supply passage leading to said device, a supply valve in said passage, a member actuated'by fluid pressure, arranged when acted upon by fluid under pressure to hold the supply valve closed, a passage for conveying an actuating fluid to the fluid-actuated member, a controlling valve in said' passage, a normally; closed and charged electric circuit, an electro-magnet in said circuit, energized thereby to normally hold the controllmgvalve open so that the fluid-actuated member shall be normally acted upon by the actuating fluid, an exhaust valve controlled by the electro-magnet, arranged to provide for escape of the actuating fluid from the fluidpressure,

'under pressure to hold the supply valve actuated member when the electro-magnet is denergized, and means for opening the supply valve when pressure on the fluid-actuated member is relieved.

19. In combination, a normally inactive train, controlling deviceadapted to be operated by fluid under pressure, a supply passage leading to said device, a supply valve in said passage, a member actuated by fluid arranged when acted upon. by fluid' closed, a passage for conveying an actuating fluid to thefluid-actuated member, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet in said circuit, energized thereby to normally hold the controlling valve open so that the fluid-actuated member shall be normally actedupon by the actuating fluid, an exhaust valve controlled by the electro-magnet, arranged to provide for escape of the actuating fluid from the fluid-actuated memher when the electro-magnet is deenergized, and a second fluid-actuated member actuated by the fluid under pressure when the pres-' sure on the first fluid-actuated member is relieved to open the supply valve and permit flow of fluid under pressure to the train controlling device.

20. In combination, a normally inactive train controlling device adapted to be operated by fluid under pressure, a supply passage leading to said device, a supply valve in said passage, a member actuated by fluid pressure, arranged when acted upon by fluid under pressure to hold the supply valve closed,a passage for conveying an actuating fluid to the fluid-actuated member, a conmember when the electro-magnet is deenergized, means for opening the supply valve when pressure on the fluid-actuated member is relieved, an exhaust passage leading from the train controlling device, and an exhaust valve in said passage controlled by the fluidactuated member and held open thereby when the fluid-actuated member is acted upon by the fluid under pressure.

21. In combination, a normally inactive train controlling device adapted to be operated by fluid under. pressure,a supply pas- .sage leading to said device, a supply valve 1n said passage, a member actuated by fluid pressure, arranged when acted upon by fluid under pressure to hold the supply valve closed, a passage for conveying an actuating fluid to the fluid-actuated member, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet in saidcircuit, energized thereby to normally hold the controlling valve open so that the fluid-actuated member shall be normally acted upon by the actuating fluid, an exhaust valve controlled by the electro-magnet, arranged to provide for escape of the actuating fluid from the fluid-actuated member when the electro-magnet is deenergized, a second fluid-actuated member actuated by the fluid under pressure when the pressure on the firstfluid-actuated member is relieved to open the supply valve and permit flow of fluid under pressure to the traincontrolling device, an exhaust passage leading from the train controlling device, and an exhaust valve in said passage controlled by the first fluid-actuated member and held open thereby when'the first fluid-actuated member is acted upon by the fluid under pressure.

22. In combination with a member actuated by fluid under pressure and a timing device also actuated by fluid under pressure, a passage for conveying fluid under pressure to the fluid-actuated member and the fluid-actuated timing device, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet 1n said circuit, energized thereby to norfluid-actuated timing device, a controllingvalve in said passage, a normally closed and charged electric circuit, an electro-magnet in sald circuit, energized thereby to nor:

mally hold the controlling valve open so that the fluid-actuated member and the fluid-actuated timing device shall be normally actedupon by the actuating fluid, an exhaust valve controlled by the electro-rn agnet, arranged to'provide for escape of the actuating fluid from the fluid-actuated member and the fluid-actuated timing device when the electro-magnet is denergizedfa fluid-operated train controlling device, valve mechanism controlling operation of said train controlling device, and an electro-magnet controlled by the timing switch, controlling said ,valve mechanism.

24. In combinationwith a memberactw.

ated by fluid under pressure and a timing device also actuated by fluid under pressure, a passage for conveying fluid, under pressure to the fluid-actuated member and thefluid-actuated timing device, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet in said circuit, energized thereby tonormally hold the controlling valve open so that the fluid-actuated member and the fluid-actuated timing device shall be normally acted upon by the actuating fluid, anexhaust valve controlled by the electro-magnet, arranged to provide for escape of the actuating fluid from the fluid-actuated member and the fluid-actuated timing device when the electro-magnet is deenergized, a fluid-actuated device, a supply passage leading to'said device, and a supply valve in said passage under the direct control of the fluid-actuated member.

25. In combination with a member actuated-by fluid under pressure and a timing device also actuated by fluid under pressure, a passage for conveying fluid under pressure to the fluid-actuated member and the fluid-actuated timing device, a controlling valve in said passage, a normally closed and charged electric circuit, an electro-magnet in said circuit, energized thereby to normally hold the controlling valve open so that the fluid-actuated member and the fluid-actuated timing device shall benormally acted upon by the actuating fluid, an exhaust valve 1 controlled by the electro-magnet, arranged to provide for escape of the actuating fluid from the fluid-actuated member and the fluid-actuated timing device when the electro-magnet is deenergized, a fluid-actuated signaling device, asupply passage leading thereto, a supply valve in saidpassage under the direct control of the fluid-actuated mein-,

valve in said passage under the control of the fluid-actuated member aforesaid, a fluidactuated train controlling device, valve mechanism controlling flow 0"f actuating fluid to said train controlling device, and an electro-magnet controlling said valve mechanism, saidlast-mentioned electro magnet I being under the control of the timing switch. 27. In combination, a member actuated by fluid under pressure and a timing switch also-actuated byfluid under'pressure, a. passage for conveying an actuating fluid to the fluid-actuated member and to the fluid-actuated timing switch, a controlling valve in said passage, a-normally closed and charged electric circuit, an electro-magnet in said circuit, normally energized thereby to hold the controlling valve open, a fluid-operated signaling device, a supply passage leading thereto, a supply valve in said passage controlled by the fluid-actuated member andheld closed by said member when the member is acted upon by fluid under pressure, a normally inactive fluid-operated train controlling device, valve mechanism controlling flow of actuating fluid to said train controlling device, an electromagnet controlling said valve mechanism, normally energized to prevent flow of actuating fluid to the train controlling device, and connections,

placing said last-mentioned electro-magnet under control of the timing switch.

28. In combination, amember actuated by ated by said electro-magnet and controlled thereby to provide for escape of the actuating fluid from the member and'the timing switch aforesaid when the electro-magnet is" deenergized, a fluid pressure operated sigfluid under pressure and a timing switch also naling device, a supply paxage leading thereto, a supply valve in said passage controlled by the fluid pressure operated member and held closed by said member when the member is acted upon by fluid under pressure, a normally inactive fluid pressure operated train controlling device, a valve controlling flow of actuating fluid to said train controlling device, an electro-magnet controlling said valve, and connections placing said last-mentioned electro-magnet under control of the timing switch.

29. In combination, a fluid-actuated member, means for conveying fluid under pressure to the fluid-actuated member, a valve controlling flow of fluid to the fluid-actuated member, a normally energized electro-magnet adapted when energized to hold said valve open, a valve operated by the fluidactuated member and held closed thereby so long as pressure is maintained on the fluidactuated member, and a device operated by fluid pressure and controlled by the valve which is controlled by the fluid-actuated member,

30. In combination with a diaphragm and a passage for conveying fluid under pressure thereto, a second diaphragm, a supply valve operated by the second diaphragm, connections between the first and second diaphragms wherebypressure upon the first diaphragm will serve to operate the second diaphragm, a third diaphragm, connections between the second and third diaphragms,

and a valve operated by the third diaphragm. 31. In a train controlling system, a member actuated byfluid under pressure, and a timing switch also actuated by fluid under pressure, a passage forconveying actuating fluid to the fluid-actuated member and the fluid-actuated timing switch, a controlling.

32. In a train controlling system, a mem- 1 her actuated by fluid under pressure, and a timing device also actuated by fluid under pressure, a passage for conveying actuating fluid to the fluid-actuated member, a controlling valve in said passage, an electro-magnet controlling operation of said controlling valve, a fluid-actuated train controlling device, a supply passage leading to said device, a supply valve in said passage, and an electro-magnet controlling the said supply valve.

33. In combination with a fluid pressureoperated train controlling device, a supply passage leading to said device and an exhaust passage leading from said device, a supply valve in the supply passage and an exhaust valve in the exhaust passage arranged so that when the one shall be opened the other shall be closed, a member actuated by fluid pressure controlling operation of said valves, a passage for conveying an actuating fluidto said member, a controlling valve in said passage, an electric circuit, and a magnet in said circuit controlling operation of the said controlling valve.

Signed at Pittsburgh, 1n the county of Allegheny and State of Pennsylvania this 17th day of Apr., A. D. 1911.

GUY P. THURBER.

Witnesses:

JOHN -F. SWEENY, PAUL ALAND. 

